A5102883115- Ferroelectric and Piezoelectric Materials
- Multiferroics and related materials
- Advanced Photocatalysis Techniques
- Electronic and Structural Properties of Oxides
- Dielectric properties of ceramics
- Microwave Dielectric Ceramics Synthesis
- Ga2O3 and related materials
- Copper-based nanomaterials and applications
- Perovskite Materials and Applications
- 2D Materials and Applications
- Luminescence Properties of Advanced Materials
- Gas Sensing Nanomaterials and Sensors
- Chalcogenide Semiconductor Thin Films
- Quantum Dots Synthesis And Properties
- TiO2 Photocatalysis and Solar Cells
- Phase-change materials and chalcogenides
- Semiconductor materials and devices
- Advanced biosensing and bioanalysis techniques
- Graphene research and applications
- Photonic and Optical Devices
- Nanowire Synthesis and Applications
- Acoustic Wave Resonator Technologies
- Advanced Condensed Matter Physics
- Iron oxide chemistry and applications
- Silicon Nanostructures and Photoluminescence
Soochow University
2014-2023
Suzhou Research Institute
2013-2017
Nanyang Technological University
2013
Hong Kong Polytechnic University
2013
Nanjing University
2009
Shanghai Jiao Tong University
2005-2006
BiFeO3 (BFO) is of considerable interest because its potential applications in the design devices combining magnetic, electronic, and optical functionalities. Effects Gd dopant on structural, photocatalytic activity, ferromagnetic properties BFO nanoparticles have been studied. X-ray diffraction Raman spectra results Bi1−xGdxFeO3 (BGFOx, x = 0, 0.05, 0.1, 0.15) reflect that crystal structure samples remain stable for < while compositional-driven phase transition from rhombohedral to...
Because of the existence interface Schottky barriers and depolarization electric field, ferroelectric films sandwiched between top bottom electrodes are strongly expected to be used as a new kind solar cells. However, photocurrent with typical order μA/cm(2) is too low practical. Here we demonstrate that insertion an n-type cuprous oxide (Cu(2)O) layer Pb(Zr,Ti)O(3) (PZT) film cathode Pt contact in ITO/PZT/Pt cell leads short-circuit increasing 120-fold 4.80 mA/cm(2) power conversion...
Bi 1 − x Eu FeO 3 (BEFOx) nanoparticles have been synthesized by a sol-gel method. The samples maintain the pure rhombohedral structure up to x=0.1, while an impure phase of EuFeO3 is observed at x=0.15. remenant magnetization BEFOx, which significantly higher than those in nonmagnetically rare-earth doped BiFeO3, found increase with concentration. Ferromagnetic coupling between Eu3+ and Fe3+ ions, evidenced our first-principles calculations, be main reason for such enhancement. In mean...
We developed a pulsed current deposition method to fabricate TiO2 inverse opals with highly dispersed Ag nanoparticles (NPs) as visible light driven plasmonic photocatalyst. It is observed that the incorporation of NPs can significantly improve photocatalytic activity in region. The sample time 45 s has highest measured activity, and exceeds Ag/TiO2 prepared by photochemical reduction method. Such an enhancement ascribed optimized localized surface plasmon resonance property NPs, excellent...
Colossal permittivity properties of Zn,Nb co-doped TiO<sub>2</sub>ceramics and pulsed-laser-deposited thin-films with different phase structures are studied.
Water splitting in a photoelectrochemical cell, which converts sunlight into hydrogen energy, has recently received intense research. Silicon is suitable as viable light-harvesting material for constructing such cell; however, there need to improve its stability and explore cheap efficient cocatalyst. Here we fabricate highly stable photocathodes by integrating crystalline MoS2 catalyst with ∼2 nm Al2O3 protected n+p-Si. acts protective passivative layer of the Si surface, while sputtering...
BiFeO 3 nanoparticles were synthesized by a sonochemical method and their magnetic behavior was investigated both experimentally theoretically. With an aid of ultrasonic irradiation, the saturated magnetization BiFeO3 at room temperature found to be increased effectively, from 0.007 0.012 μB/Fe. The postannealing x-ray photoemission spectroscopy results demonstrate that oxygen vacancies can generated due irradiation play important role increase ferromagnetism. Our first-principles...
Pb(Zr,Ti)O3 (PZT) film with a band gap of 3.6 eV was prepared on In2O3:Sn (ITO) coated glass, and then an amorphous silicon (a-Si) narrow 1.8 deposited the PZT/ITO/glass. The short-circuit current Ag/a-Si/PZT/ITO/glass sample is 2.56 mA cm−2, about 50 times greater than that Pt/PZT/ITO/glass sample. energy level a-Si well matched PZT film, which beneficial to transport UV-visible light-induced charges in photovoltaic output can be tuned by changing dopant type maximum photoelectric...
EuFeO 3 (EFO) nanoparticles were prepared by sol–gel method with an aid of tartaric acid at different calcination temperatures. The EFO samples characterized differential thermal analysis–thermogravimetry, X‐ray diffraction, Fourier transform infrared spectra, Raman transmission electron microscopy, UV‐visible diffuse reflectance spectrum, N 2 adsorption/desorption measurements, and photoluminescence spectra. photocatalytic activity the was evaluated decolorization rhodamine B aqueous...
A facile sol–gel approach with a fixed calcination temperature is developed to prepare BiFeO3 (BFO) nanoparticles, and the gel-drying adjusted control appearance of γ-Fe2O3 parasitic phase. The room ferromagnetism samples strongly dependent on temperature. When increases from 80 140 °C, saturated magnetization corresponding jumps 0.22 emu g−1 1.2 g−1, allowing nanoparticles be magnetically separated in solution. From examination by transmission electron microscopy X-ray photoelectron...
Chemical-vapor-deposited single- and bi-layer graphene sheets have been transferred onto n-type GaAs substrates. The rectifying characteristics photovoltaic behaviors of graphene/GaAs junctions systematically investigated. can be combined with the underlying substrates to form Schottky junctions. For bilayer graphene, junction shows effects open-circuit voltage 0.65 V short-circuit current density 10.03 mA/cm2, yielding a power conversion efficiency 1.95%, which are superior single-layer...
When a Si photocathode is used in photoelectrochemical cell for H2 production, an open nanostructure capable of enhanced light absorption, low surface recombination, and being fully protected by thin protective layer highly desirable. Here, we explored stable efficient multi-crystalline (mc) n+p silicon photocathode. A pyramid-like on mc-Si wafer was fulfilled through two-step metal-catalyzed chemical etching process, then junction Al2O3 constructed. The exhibits high stability continuous...
Highly efficient and stable Si photocathodes were fabricated for water splitting by manipulating the loading of Pt catalyst TiO<sub>2</sub> protective layer.
Abstract Ferroelectric van der Waals (vdW) heterostructure have recently emerged as a low‐power, versatile device paradigm because it combines the great diversity of 2D materials and memory nature ferroelectrics. The non‐volatile field effect generated by polarization bound charge is pivotal factor for device's performance. Unfortunately, microscopic studies on interplay between switching electrostatic coupling at heterojunction remain largely overlooked. Herein, authors investigate...
Abstract Recent progress in two-dimensional ferroelectrics greatly expands the versatility and tunability van der Waals heterostructure based electronics. However, switching endurance issue that widely plagues conventional practical applications is hitherto unexplored for layered ferroelectrics. Herein, we report observation of unusual polarization fatigue behaviors CuInP 2 S 6 , which also possesses finite ionic conductivity at room temperature. The strong intertwinement short-range...
Photoelectric behavior of Pt sandwiched Pb(Zr0.20Ti0.80)TiO3 (PZT) films deposited on Pt∕Ti∕SiO2∕Si substrates by a sol-gel method was investigated testing the short-circuit photocurrent under different film thicknesses. By poling step with increased magnitude and alternated direction dc electric field, interesting photoelectric found when PZT were in virgin or poled up/down state. The also strongly dependent thickness. A simple model proposed to separate effects interface Schottky barriers...
We reported in this study that the photoluminescence (PL) spectra of (Ba0.77Ca0.23)TiO3:Pr3+ were sensitive to both polarization and phase transitions ferroelectric ceramics. Comparing with unpoled sample, all red emissions under different temperatures 50to300K increase about 30% for poled 0.1mol% Pr3+-doped ceramic. Obvious peaks around 100K blue emission intensities Pr3+ ions found when ceramic passed through orthorhombic-tetragonal transition, a step decrease intensity occurs...
Recent success in exfoliating violet or Hittorf's phosphorus down to monolayer reignites the research passion this ancient yet mysterious material, questing for superior electronic and optoelectronic functionalities. Unfortunately, poor air stability that plagues black also exists counterpart. Aiming provide more insight into degradation chemistry accordingly find a facile solution it, herein, we employ concerted elemental, chemical vibrational spectroscopies reveal critical role of oxygen...
Recently, large-scale photonic integrated circuits have seen rapid development. Optical switches are the elementary units used to realize optical routers and processors. However, high static power large footprint of silicon electro-optic thermo-optic becoming an obstacle for further scaling high-density integration. In this Letter, we demonstrate a <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:mn>2</mml:mn> </mml:mrow>...
The structural, luminescent, dielectric, and magnetic properties of multifunction Eu3+-doped SrTiO3 (STO) ceramics were investigated at room temperature. Three different charge compensation mechanisms realized by substituting Eu ion sites. It was found that the samples strongly depended on positions ion. Compared with substitution Sr or Ti site samples, photoluminescence intensities dielectric constant both sites substituted obviously enhanced, mainly ascribed to small lattice distortion...
ITO/Pb(Zr,Ti)O(3) contacts and Ag nanoparticles were used to construct a novel ferroelectric film photocathode exhibiting stable short-circuit photocurrent of 110 μA cm(-2) an open-circuit voltage 0.76 V under 100 mW Xe-lamp illumination zero-bias versus SCE.
Pure and Co/Fe doped CaCu3Ti4O12 (CCTO) ceramics were prepared by solid state reaction method. The electrical properties of found to be dependent on the type dopant materials. A multirelaxation mechanism should considered for common observed (50–200 K) dielectric relaxation CCTO ceramic. In relatively high temperature range, this followed Arrhenius behavior with activation energy 68 meV, which was ascribed Maxwell–Wagner (MW)-type associated grains. lower exhibited variable-ranger-hopping...
We investigated and compared the photoelectric behavior of Pt sandwiched (Bi3.7Nd0.3)Ti3O12 (BNT) Pb(Zr0.2Ti0.8)O3 (PZT) films deposited by sol-gel method. Based on analysis photocurrent I-V characteristics, top bottom Pt/film interface Schottky barriers are found to be more symmetric in BNT, that PZT. The photocurrents originated from depolarization field due alignment ferroelectric polarization different, although polarizations two about same. mechanism behind origin different behaviors...